Dear MathGroup,
Here is the kind of thing that is giving me trouble:
¥ First - I want to renormalize the list d
d := {1, 2, 3, 4}
according to the rule
Renorm[{S_, P_, N0_}] = d/b
where
b := (1+S)^(P/2)/(Sqrt[N0]).
Parameters S, P and N0 are defined in the
ParamList := {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}}
each set {S, P, N0} corresponding to the respective value of d in the
list.
I can do it for a d = const this way:
Vectors := Table[f[i], {i, Length[ParamList]}]
ToNumbers := Thread[Vectors -> ParamList]
RenormArray := Outer[Renorm, Vectors]
RenormNbrs := RenormArray /. ToNumbers
But it obviously doesn't work if d has more than one element. In this
case
I end up with a whole matrix, but I only need the diagonal elements. I
am
REALLY tempted to do
RenormD = Table[RenormNbrs[[i,i]], {i, Length[[ParamList]}],
but there_should_be a more elegant way of doing this.
Can someone help me out here?
¥ Second question - does anybody have a hint for getting closer to the
global
minimum of ChiSquared in NonlinearFit (Method -> FindMinimum)? With
3-parameter
models it gets out of hand.
THANKS!
Vicki
________________________________________________________________________
Victoria Steblina Email: vvs124 at rsphy1.anu.edu.au
Optical Sciences Centre Tel: 61 6 249 5129
Research School of Physical Fax: 61 6 249 5184
Sciences and Engineering
Australian National University
Canberra, ACT 0200, Australia
________________________________________________________________________
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